Flexible seal for mixers



640,174 F. E. BAGER FLEXIBLE SEAL' FOR MIXERS Aug. 23, 1927.

Filed Feb. 1, 1926 Patented Aug. 23, 1927. V

UNITED STATES PA EN OFFICE.

FR-EDERIC E. BAGER, OF SOUTH MILWAUKEE, WISCONSIN, ASSIGNOR TO THE '1. I4. SMITH COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

FLEXIBLE SEAL FOR MIXERS.

Application filed February 1, 1926. Serial No. 85,185.

This invention relates to a new and improved concrete mixer construction and more particularly to a construction in which the connection between the material handling 8 members and material receiving members is provided with a sealing element.

Many types of concrete mixers now constructed, and particularly paving mixers, are provided with material handling means adapted to discharge material into a feed chute or other material receiving member.

With paving mixershaving skips in which the charge is placed and the skip then elevated to discharge the material into the mix- 5 er chute, there is a certain amount of scattering of material through the clearance provided between the chute and skip. Since these are heavy metal parts and are rapidly and repeatedly moved, it is necessary to provide a working clearance. Through this clearance some material is lost, especially the fine sand and cement. This loss particularly takes place as the skip moves away from the chute in returning to the loading position.

It is an object of the present invention to provide new and improved means for sealing the connection between the material handling and material receiving members of a concrete mixer or the like.

It is an additional object to provide a scaling in machines of this character in which it is made of light flexible material and does not wear the parts or cause power losses.

Other and further objects will appear as the description proceeds.

I have illustrated somewhat diagrammatically a preferred form of my invention in the accompanying drawings, in which Figure 1 is a fragmentary view showing a loading skip nose and its associated feed chute provided with my improved seal;

Figure 2 is a face view of the seal of Figure 1, and

Figure 3 is a view similar to Figure 2, but showing a modified form of device.

In the drawings the loading skip nose 11 is connected by arm 12 to the link 13 which is pivotally supported at 14 to a fixed portion of the mixer. The lug 15 on the arm 5 12 is adapted to engage the lug 16 on the link 13, and the upper portion of the movement of the skip is upon an arc with the pivot 14 as a center. The chute 17 is connected to a fixed portion of the mixer and is provided with the flexible seal 18 which is secured in place by the washer or ring 19. The ring 19 is secured to the flange 20 on the chute by means of bolts or rivets 21. In the form of construction shown in Figures 1 and 2, the sklp nose and the flexible seal are both approximately semicircular in shape. For use'with certain types of skips having tubular noses it may be desirable to provide a circular sealing member 22 as shown in Figure 3. This member would be secured in place upon the feed chute by means of a ring 23 or bolts or rivets 24.

The flexible seal may be formed of heavy rubberized fabric or any similar flexible ma- '0 terial. Due to the arc of movement of the edge of the skip nose, it is essential that the seal be flexible to permit passage of the skip nose to the broken line position of Figure 1, the path being indicated by the broken 76 line 25. The flexible seal will not wear the parts and when itself worn out may be readily removed and a new one put in place by removing the retaining ring.

While I have illustrated certain preferred 80 embodiments of my invention, it is capable of further modification to meet varying conditions and I contemplate such changes as come within the spirit and scope of the appended claims.

I claim:

1. In a concrete mixer, a material handclling member, a material receiving member, the handling member being adapted to be moved toward and away from the receiving member, and flexible means carried by one of the members and adapted to engage the other member to make a tight joint between them when the members are moved together.

2. In a concrete mixer, a material handling skip, a material receiving chute, the skip being adapted to be moved toward and from the chute and resilent sealing means carried by one of the members and adapted ber carried by the chute and adapted to to yield to permit passage of the other memyield to permit passage of the nose of the 10 her to engage the other member to make skip and to spring upwardly to engage the a tight joint therebetween. skip in the rear of the nose and to make 3. In a concrete mixer, a material hana tight joint With the skip.

dling skip, a material receiving chute, the Signed at South Milwaukee, lVisconsin,

skip being adapted to be moved towardand this 28th day of January, 1926.

from the chute, and a flexible sealing mem- FREDERIC E. BAGER. 

